Clint
A golden opportunity to try your skills in identifying quite a few rather indifferent "doppeldeckers".
Isn't X5120, 5124 and 5126 the same photos by the way?
Since the seller (again) has made huge efforts to help out (I hope you can at least sense my tongue in cheek) you simply must have a field day here!!
Joking aside, there are three photos, a little bit more interesting than the rest, actually showing ID numbers. One looks like an Albatros B.II, but the other two??
Cheers
Stig